121128427 has 4 divisors (see below), whose sum is σ = 138432496. Its totient is φ = 103824360.

The previous prime is 121128379. The next prime is 121128433. The reversal of 121128427 is 724821121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121128427 - 2⁷ = 121128299 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121128395 and 121128404.

It is not an unprimeable number, because it can be changed into a prime (121128437) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8652024 + ... + 8652037.

It is an arithmetic number, because the mean of its divisors is an integer number (34608124).

Almost surely, 2^121128427 is an apocalyptic number.

121128427 is a deficient number, since it is larger than the sum of its proper divisors (17304069).

121128427 is an equidigital number, since it uses as much as digits as its factorization.

121128427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17304068.

The product of its digits is 1792, while the sum is 28.

The square root of 121128427 is about 11005.8360427548. The cubic root of 121128427 is about 494.7836717549.

Adding to 121128427 its reverse (724821121), we get a palindrome (845949548).

The spelling of 121128427 in words is "one hundred twenty-one million, one hundred twenty-eight thousand, four hundred twenty-seven".